Express Form User Field3 users found helpful
If not, is there a straightforward way to do this (ideally via the UI)?
Any luck figuring this out?
Using it you could create a custom attribute extending the text attribute but instead of showing a text box it would generate a hidden input with the user ID as a value. You could then add that attribute to your express form like any other attribute.
Am going to try building the custom attribute and see if that works, thanks mnakalay.
So what I would suggest is maybe, when extending the text attribute, create an attribute that uses at the same time the normal text input and a hidden field. Say you then use it for a "what is your name" field so that the label serves a purpose and the hidden field is added at the same time.